This next area can really suck if you're low on health or ammo. Rather
than wasting your time trying to kill every single alien hanging around,
loop around to tbe backside of the big floating island and find a cavern
that takes you down inside.
Once inside, you'll need to make your way through a series of rooms,
bashing your way through webbing every once in a while, until you come to
the side of a large column which lowers and raises.
Hop on the column and ride it all the way to the top. You'll have to
rely on your jumping skills again; jump from platform to platform, until
you come close enough to a flying-manta-ray creature to jump on its back.
It'll shuttle you over to a another little floating platform with a
teleport on it.
(If you have some juice left in your gauss gun and you don't feel like
dealing with all the aliens roaming around this level, you can charge up
your gun while riding up the initial column and gauss-jump to the teleport.
It's a tricky process -- you have to aim in the exact opposite direction
as the little island, and fire the gun at the right time so you're launched
far enough to hit the platform but not too far as to fly right over it.)
In this next area, make your way into the cave where you'll find a Big
Blue lurking around. When he starts to chase you, jump up into a little
side passageway of the cave and let him pass by, then jump down behind him
and keep going.
Make your way past the three tentacle creatures (you should know how to
do this by now) and around a few bends will be another teleporter.
You'll arrive inside some sort of alien factory. At this point the
aliens will mostly ignore you, so wait until you're sure you've been
noticed before killing everything that moves. Take the cog-elevators up
the the conveyor belts. Take the conveyor that isn't blocked by a force
field and keep going.
You'll see lots of strange keg-like things sitting around. Try not to
shoot any as alien grunts will pop out, and you don't have enough ammo to
take care of them all. There will be one keg that blocks your path,
however, so you'll have to deal with at least one.
Find a sort of vent shaft in the corner of one room with little glowing
lights inside. Jump in and drop down until you come out into another room.
There will be lots of alien controllers and slaves to deal with, but
you'l have to make your way up to the very top of the room, where there's a
spinning teleport thing. Go up ramps and spinning cog platforms to make
your way to the teleporter. Before you go through, make sure that you have
ample health, as the final boss awaits.
